Tympan gauge



July 26, 1949.

H. LARO TYMPAN GAUGE Filed May 21, 1947" Patented July 26, 19 49 TYMPAN" GAUGE s;.Hcurs lare;rllostoll-zcMasse l AlmlieationlMay. 21?.1947, semrnatdndestr Tofiarovidea tympan ggagewhich-" may be-easily and-seeurelyapprliectto a 'tympamsh'eet in accru ratelyadj-usted;position;

Te -provide a gage that will lie' snug'atall times--*- to thef'ty-mpamsheet and 'a'llhf itsopefable parts funetioh through'andwithin' planesparallel with the sheet,= and-with its o1 ampi-ngarm-turning in a plane-parallel-With thesheet;

Te 'p-rovide; also a gagedn'which a '-finger-'em-' 1O ploy'ed to preventupwaid displacement'of' a sheet" wherr' held*against thej edge"f"=the*-gage' is one easily applied to have any:properlyadjusted posn tion'; oneeasily repla-ceablej=-and--one thairis held locked in pl-aee-"by the same means athahsecmes-"lfi thega'ge' to*t'he tympan'she'eti The invention can'best beseen gand understood by reference to thedrawingsin 'which'- Figf l -is 'a- 'planmf'jthe'g-age shown'applie'dmr clamped-teatyinpansheet: '=-20 Figf z is analogous -toFig.'- :1 excepting manna V gageisshdW-n in an' unlclampedhosition to illus-" trate' themanner'of. its'applieation' to the 'tympan sheetr aforesaidr Fig.3 isja' seetion' omth'e" line 3 3 "offFigf'l. 1'25 Figf-4-is a sectiononzthe'line 3 -4 "of" Fig: 1 and Ei"g'f*-5-5Shbws':in perspective-the diiferentele?-"" mentsWhich are 'combinedto form the'gage.

The gage is secured to the tympairsheet by'a clamp-'nonsisting-of a. :ho'tto'rmplate l, and a. 'top"30 plate"? becupyingmsuperposed relation ;to* the bottom plate? parallel thereto? The: two plates arejgenerally rectangular in ioi'm,"the "top plate" being slightlysmallenithan the bottom plate?- Cerltrallfdisposed withre'lati'on "toth'ewespeoa" tive plates l ,andezlis a vertical post3'having""a head l-anda tubular lower end 5. The post passes through an opening-8.- in the plate 2, which is slidable thereon, and. the lower end of the post passes through: an opening l-in thepl'ate l anddsrfixedlyls set within a socket 8 formed withinrthemnder side?" of this plate as=slmwn in Eig: 4.-.

The top plate 2 is prevented from turning on the post 3- by flanges on th respective pl'ates.'--= The flnlate I I isfineised-aleng-eachmf-"its opposite sides'ito form 'upstanding'flanges l 0& The; plate 2 is provided along-its opposite sid -'--with "down-- turned flanges 4 l--whieh--overlap-*the* fIan-ges l-IF on the'plate l;lying-parallel therewitlr and snugly -j adjaeentthereto'sothat the flahges lilandi i W will co-operate to prevent the plate 2 from turning. When the plates l and 2 are in engagement the plate 2 will have been moved down so that its flanges II will engage the plate I along its sides just inwardly inset from its side edges. When still be maintainedi i downtur-nedflahges42 whiehi when the two plates on the plate-"iw-ill 'squarely ehgagetheplate I.

with the=-adjacent faces of theyrespective plates which the pQst'3*--i assesf%Thisspring acts toner thedotted lir'r'es-of -Fig? 1i the-cams willlie-consides *of the postfl between me plate 2- and the parts are thus positioned the plate 2, extensions 26 and 21 of the finger, and the washer I! will all lie in snug assembly beneath the head 4 of the post. The cams 20 and 2| 0n the clamping lever will then he contained within the slot 28 of the Arranged{tofturnnhorizontaliyflon" the post 3 betweenthqplate'ZZand a'washe'rl "I" on the post Barnaby thefga'getis a fingerdFhaving end extensionsfili and avem a; slot 28"betweemthe extensions? Wiemthe 'ola'mpingfl-ever l8 is lying" the--plates are tmem yine ardisengage'ct position' the co opera-tiverelatidn"between the flanges -l El" and ll foi preventing turning of the plate-'2 'v/ill r Th'e'j pl'ate -Z' is -provided 1 alongits "ends with" forma-housing'44 in'whieh is placed alJ-shaped spring= |5 having-in itanop'ening ifi through- 'mallvimaintainfthetwo""plates in""dis'engagement but-is oanalbl'bf being flattened; so enabling the plates being brought into-engagement'witlr'the flangesnrfthe blatef 2 ""eneja'ging'theqnlate l "as This clamping lever is-hrcividdwith 'cams120 "and 2| laterally ofiset from the opening Hiinthe' levelithrougwwhieh the post-extends"- Each of these-cams"has*the-f0i-m='of "a --pimple formed by indeiiting'the plate which. forms "the" clamping lever. "*When the mlamping lever is inactive; 1 turned" to a-positi'tinnornTaP-to the-longitudinal line"ofthe clampingbhttes' l--"an d"'2 as-shown-in tainede withi'ri' openingsf 22 i"? 2 3; ior med iwth'e finger and may then enter the openings 22 and 23 prepared for them in the plate 2. On turning the clamping lever away from its inactive position into an active position in longitudinal alignment with the clamping plates as shOWn in full lines of Fig. 1, its cams will then ride up over the extensions 26 and 21 of the finger as shown in Fig. 4, thereby flattening the spring I5 and moving the clamping plates into an engaged position, the tensionofthe' spring then enabling the cams on the clamping lever, by their bearing against the extensions of the finger, to hold the finger securely in place.

The general operation is as follows:

The tympan sheet A is provided with two parallely spaced slits a, a. The spaced location of these slits, as may be seen by reference to Fig. 3, is such that when the gage is applied to the tympan sheet, as shown in Fig, 2, the plate I I is applied to extend in part over that portion a of the tympan sheet lying between the slits a, a, and the ends of the plate 1 to extend beneath the portions :1 of the tympan sheet lying outwardly adjacent the slits. The portions a of the tympan sheet will then lie interposed between the ends of the plate 1 and the flanges on the plate 2 which engage these ends when the plates are brought into engagement, but lying spaced from the ends of the plate I, permitting of the insertion of the portions a of the tympan sheet, when the plates are in disengagement. Having thus initially applied the gage to the tympan sheet then on turning the clamping lever so that its cam will ride up upon the extensions of the finger, as previously explained the clamping plates will be thrown into engagement and the flanges on the top plate will grip the portions a of the tympan sheet then lying between the ends of the plate I and the adjacent flanges on the plate 2. At the same time the finger will be held securely in place by the cams on the clamping lever as previously explained. 7

After the fixing of the gage to the tympan sheet 4. plate and with said post extending through said slot, means for maintaining said plates, clamping lever and end extensions of the finger in closely nested relation to each other when said spring lies undistorted and said top plate is occupying a disengaged position with relation to the bottom plate, and cam forming means borne by said clamping lever normally contained for a determinate turned position of the lever to lie in the slot between the said endextensions of the finger when the top plate is occupying a disengaged position as aforesaid and to have bearing engagement against said end extensions of th finger when the lever is turned thereby distortin said spring, moving said top plate into engagement with the bottom plate, and locking said finger.

2. In a tympan gage the combination comprising a set of top and bottom plates, means for maintaining said plates in aligned position and enabling said top plate to occupy an engaged or disengaged relation to the bottom plate, said means including a post fixed to the bottom plate with extension through the top plate, flanges borne by the top plate and engaging the end portions of the bottom plate when the top plate is in its said engaged position, said flanges together with the adjacent faces of said plates forming a housing between said plates, a spring contained within said housing normally functioning to hold said top plate in a disengaged position with relation to the bottom plate but distortable to permit of engagement between said plates, a clamping love? on said post arranged to turn within a plane normal thereto, a finger having spaced end extensions with slot between said extensions interposed between said clamping lever and said top the flange l2 on the plate 2 will provide an edge against which the sheet to be positioned-may bear.

The gage is reversible in that either of the flanges 12 may provide the edge against which the sheet to be positioned may have bearing dependent upon the turned position of the gage.

I claim:

1. In a tympan gage the combination comprising a set of top and bottom plates, means for maintaining said plates in aligned position and enabling said top plate to occupy an engaged or disengaged relation to the bottom plate, said means including a post fixed to the bottom plate with extension through the top plate, flanges borne by the top plate and engaging the end portions of the bottom plate when the top plate is in its said engaged position, said flanges together with the adjacent faces of said plates forming a housing between said plates, a spring contained within said housing normally functioning to hold said top plate in a disengaged position with relation to the bottom plate but distortable to permit of engagement between said plates, a clamping lever on said post arranged to turn within a plane normal thereto, a finger having spaced end extensions with slot between said extensions interposed between said clamping lever and said top plate and with said post extending through said slot, flanges on the extensions overlapping the flanged sides of the top plate for assisting in the positioning of the finger, means for maintaining said plates, clampin lever and end extensions of the finger in closely nested relation to each other when said spring lies undistorted and said top plate is occupying a disengaged position with relation to the bottom plate, and cam forming means borne by said clamping lever normally contained for a determinate turned position of the lever to lie in the slot between the said end extensions of the finger when the top plate is occupying a disengaged position as aforesaid and to have bearing engagement against said end extensions of the finger when the lever is turn d thereby distorting said spring, moving said t p plate into engagement with the bottom plate, arid locking said finger.

HENRY LARO.

REFERENCE S CITED The following reierenices are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 449,290 Megill wMar. 31, 1891 511,154 Megill Dec. 19, 1893 910,155 Strait Jan. 19, 1909 1,066,011 Hellmich July 1, 1913 1,430,911 Linebaugh Oct. 3, 1922 2,100,217 Johnson Nov. 23, 1937 

